As I write this, I'm wating for the next BOOM! Earlier today while taking a nap, I was awakened by a house rattling boom. I mean the windows actually were shaking. After taking a look around I found nothing. The noise is coming from a lower floor, basement or 1st floor but I can't figure out where. Sounds like someone SLAMS a door or dropping something really heavy. Any suggestions as to what this is and how to stop it?